Author: Cyborg Date: To: exim-users Subject: Re: [exim] data timeout on connection
Am 18.10.19 um 14:38 schrieb Jeremy Harris via Exim-users: > On 18/10/2019 13:06, Hardy via Exim-users wrote:
>> And NOW:
>> 2019-10-18T13:56:03.718183+02:00 mailfass exim[4587]: SMTP data timeout
>> (message abandoned) on connection from hummus.csx.cam.ac.uk
>> [131.111.8.88] F=<exim-users-bounces+bulk=mailfass.de@???>
>>
>> Perhaps someone from your side may have look ;-)
> Not our problem :)
>
>
Don't be so quick to reject it...
As I worked for another company, we stumpled over some wired problems.
Customer mailclients said, they have send a mail,
but the server said: the other one disconnected after xxx seconds. same
as above.
The reason why that happend got tracked down by linux kernel devs. The
TCP IP stacks of the server and the client had a tcp window problem.
This manifested itself with both sides waiting for the otherside to sent
data. One side (windows) hat sent "QUIT", but the tcp window mismatch
made the linux tcp stack think, that nothing came. So both waited until
timeout and the mailclient thought: worked, and exim said "crap! drop it"
You correct, it's not exims problem. Linux kernel devs said: not out
fault, shit happens.. but they also said, that similar kernels should
not have this problem. This brings me to the conclusion, that one of you
may need a kernel update.
